programa para hacer un formulario

var div = document.createElement("div")
    div.className = "form-group"
    var label = document.createElement("label")
    label.innerHTML = "Producto"
    div.appendChild(label)
    var input = document.createElement("input")
    input.type = "text"
    input.name = "products[]"
    input.className = "form-control"
    div.appendChild(input)
    document.querySelector("#formulario").appendChild(div)